Honda CRF450R 2011 User Manual

Clutch System
(cont’d)
Servicing Your Honda 69
Replace the clutch discs (1) if they show signs of
scoring or discoloration.
Measure the thickness of each clutch disc.
Service Limit: 2.85 mm (0.112 in)
Replace the clutch discs and clutch plates as a set.
Check the clutch plates (2) for excessive warpage
or discoloration.
Check the plate warpage on a surface plate using a
feeler gauge.
Service Limit: 0.15 mm (0.006 in)
Replace the clutch discs and plates as a set.
If you feel the clutch slippage when replacing the
clutch discs and plates, replace the clutch springs.
1. Install the spring seat (1) and judder spring (2)
onto the clutch centre as shown. Coat the
clutch discs (3) and clutch plates (4) with
engine oil.
2. Install the clutch disc A (larger I.D. disc) (5)
onto the clutch outer.
Stack the seven clutch plates and seven clutch
discs alternately.
3. Insert the clutch lifter rod (6) into the
mainshaft.
4. Apply engine oil to the needle bearing (7) and
washer (8) and install them onto the clutch
lifter (9).
5. Install the clutch lifter onto the rod.
6. Install the clutch pressure plate (10).
7. Install the four clutch springs and bolts (11).
8. Tighten the bolts in a crisscross pattern in two
or three steps to the specified torque:
12 N·m (1.2 kgf·m, 9 lbf·ft)
Clutch Disc/Plate Inspection
(1) clutch disc
(2) clutch plate
(1)
(2)
Clutch Disc/Plate Installation
(1) spring seat (4) clutch plates
(2) judder spring (5) clutch disc A
(3) clutch discs
(3) (2)
(1)
(4)
(5)
(6) clutch lifter rod (8) washer
(7) needle bearing (9) clutch lifter
(10) clutch pressure plate
(11) clutch springs and bolts
(8) (7)(9) (6)
(10)
(11)
CRF450R.book Page 69 Thursday, July 8, 2010 9:34 AM

Honda CRF450R 2011 Specifications

General

Engine Type	449cc liquid-cooled single-cylinder four-stroke
Bore x Stroke	96.0mm x 62.1mm
Compression Ratio	12.0:1
Transmission	Close-ratio five-speed
Final Drive	#520 chain; 13T/48T
Front Brake	Single 240mm disc with twin-piston caliper
Rear Brake	Single 240mm disc
Front Tire	80/100-21
Rear Tire	120/80-19
Trail	114mm (4.5 inches)
Induction	PGM-FI, 46mm throttle body
Front Suspension	48mm inverted with rebound and compression damping adjustability; 12.2 inches travel
Rear Suspension	Pro-Link single shock with rebound and compression damping adjustability; 12.4 inches of travel
Wheelbase	58.7 inches
Seat Height	37.6 inches
Fuel Capacity	1.5 gallons